Mercurial > repos > blastem
annotate system.c @ 1708:5bfed2eedc9d
Fixed flag calculation for sub instructions in CPU DSL
author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 28 Jan 2019 22:37:46 -0800 |
parents | 360d5bab199f |
children | 5dacaef602a7 7b62e6805e6a |
rev | line source |
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1 #include <string.h> |
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2 #include "system.h" |
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3 #include "genesis.h" |
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4 #include "sms.h" |
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5 |
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6 uint8_t safe_cmp(char *str, long offset, uint8_t *buffer, long filesize) |
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7 { |
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8 long len = strlen(str); |
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9 return filesize >= offset+len && !memcmp(str, buffer + offset, len); |
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10 } |
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11 |
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12 system_type detect_system_type(system_media *media) |
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13 { |
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14 if (safe_cmp("SEGA", 0x100, media->buffer, media->size)) { |
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15 //TODO: Differentiate between vanilla Genesis and Sega CD/32X games |
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16 return SYSTEM_GENESIS; |
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17 } |
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18 if (safe_cmp("TMR SEGA", 0x1FF0, media->buffer, media->size) |
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19 || safe_cmp("TMR SEGA", 0x3FF0, media->buffer, media->size) |
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20 || safe_cmp("TMR SEGA", 0x7FF0, media->buffer, media->size) |
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21 ) { |
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22 return SYSTEM_SMS; |
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23 } |
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24 //TODO: Detect Jaguar ROMs here |
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25 |
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26 //Header based detection failed, examine filename for clues |
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27 if (media->extension) { |
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28 if (!strcmp("md", media->extension) || !strcmp("gen", media->extension)) { |
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29 return SYSTEM_GENESIS; |
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30 } |
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31 if (!strcmp("sms", media->extension)) { |
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32 return SYSTEM_SMS; |
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33 } |
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34 if (!strcmp("j64", media->extension)) { |
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35 return SYSTEM_JAGUAR; |
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36 } |
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37 } |
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38 |
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39 //More certain checks failed, look for a valid 68K reset vector |
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40 if (media->size >= 8) { |
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41 char *rom = media->buffer; |
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42 uint32_t reset = rom[4] << 24 | rom[5] << 16 | rom[6] << 8 | rom[7]; |
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43 if (!(reset & 1) && reset < media->size) { |
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44 //we have a valid looking reset vector, assume it's a Genesis ROM |
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45 return SYSTEM_GENESIS; |
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46 } |
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47 } |
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48 return SYSTEM_UNKNOWN; |
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49 } |
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50 |
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51 system_header *alloc_config_system(system_type stype, system_media *media, uint32_t opts, uint8_t force_region) |
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52 { |
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53 void *lock_on = NULL; |
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54 uint32_t lock_on_size = 0; |
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55 if (media->chain) { |
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56 lock_on = media->chain->buffer; |
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57 lock_on_size = media->chain->size; |
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58 } |
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59 switch (stype) |
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60 { |
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61 case SYSTEM_GENESIS: |
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62 return &(alloc_config_genesis(media->buffer, media->size, lock_on, lock_on_size, opts, force_region))->header; |
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63 #ifndef NO_Z80 |
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64 case SYSTEM_SMS: |
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65 return &(alloc_configure_sms(media, opts, force_region))->header; |
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66 #endif |
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67 default: |
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68 return NULL; |
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69 } |
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70 } |